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Code distributed by Google as part of the polymer project is also
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<!--
A `paper-menu-button` is a `paper-icon-button` that opens a drop down menu when tapped.

Example:

    <paper-menu-button icon="menu">
      <div>Menu Item 1</div>
      <div>Menu Item 2</div>
      <div>Menu Item 3</div>
    </paper-menu-button>

 @group Paper Elements
 @element paper-menu-button
 @extends paper-focusable
-->
<link href="../polymer/polymer.html" rel="import">
<link href="../core-icon/core-icon.html" rel="import">
<link href="../core-menu/core-menu.html" rel="import">
<link href="../paper-focusable/paper-focusable.html" rel="import">
<link href="../paper-shadow/paper-shadow.html" rel="import">
<link href="paper-menu-button-overlay.html" rel="import">
<link href="paper-menu-button-transition.html" rel="import">

<polymer-element name="paper-menu-button-overlay-container" noscript>
<template>
  <content></content>
</template>
</polymer-element>

<polymer-element name="paper-menu-button" extends="paper-focusable" attributes="src icon opened halign valign slow" on-tap="{{tapAction}}">
  <template>
    <link rel="stylesheet" href="paper-menu-button.css">
    <paper-menu-button-overlay target="{{$.overlay}}" relatedTarget="{{}}" halign="{{halign}}" valign="{{valign}}" opened="{{opened}}" transition="paper-menu-button-transition-top-{{halign}}{{slow ? '-slow' : ''}}"></paper-menu-button-overlay>
    <paper-menu-button-overlay-container id="overlay">
      <paper-shadow target="{{$.overlayBg}}" z="0" hasPosition></paper-shadow>
      <div class="paper-menu-button-overlay-ink"></div>
      <div id="overlayBg" class="paper-menu-button-overlay-bg"></div>
      <core-menu id="menu">
        <content></content>
      </core-menu>
    </paper-menu-button-overlay-container>
    <core-icon src="{{src}}" icon="{{icon}}"></core-icon>
  </template>
  <script>
    Polymer('paper-menu-button', {

      publish: {

        /**
         * If true, this menu is currently visible.
         *
         * @attribute opened
         * @type boolean
         * @default false
         */
        opened: { value: false, reflect: true },

        /**
         * The horizontal alignment of the pulldown menu relative to the button.
         *
         * @attribute halign
         * @type 'left' | 'right'
         * @default 'left'
         */
        halign: { value: 'left', reflect: true },

        /**
         * The vertical alignment of the pulldown menu relative to the button.
         *
         * @attribute valign
         * @type 'bottom' | 'top'
         * @default 'top'
         */
        valign: {value: 'top', reflect: true}
      },

      /**
       * The URL of an image for the icon.  Should not use `icon` property
       * if you are using this property.
       *
       * @attribute src
       * @type string
       * @default ''
       */
      src: '',

      /**
       * Specifies the icon name or index in the set of icons available in
       * the icon set.  Should not use `src` property if you are using this
       * property.
       *
       * @attribute icon
       * @type string
       * @default ''
       */
      icon: '',

      slow: false,

      tapAction: function() {
        if (this.disabled) {
          return;
        }

        this.super();
        this.toggle();
      },

      /**
       * Toggle the opened state of the menu.
       *
       * @method toggle
       */
      toggle: function() {
        this.opened = !this.opened;
      }

    });
  </script>
</polymer-element>
